Index 



337 



Parachordal rods: Frog, 75; 

 Chick, 266 



Parasphenoid : Frog, 75 



Parietals: Frog, 77 



Parovarium: Chick, 236 



Parthenogenesis, 15 



Partial cleavage or segmen- 

 tation, 97 



Pecten: Chick, 182 



Penial urethra, 318 



Penis, 318 



Pericardial cavity: Frog, 60, 

 72; Chick, 270-273 



Perineum, 316-320 



Peripheral nerves: Frog, 40; 

 Chick, 173 



Perivitelline space, 286 



Permanent segmentation : 

 (see Secondary segmen- 

 tation) 



Pes: Chick, 265 



Pharynx : Frog, 46;Chick, 204 



Pineal body: Frog, 39 



Pituitary body: Frog, 37-38 



Placenta, 93, 172 

 foetal, 307-312 

 maternal, 300 



Plakodes: 276 



Pleural cavity: Chick, 270- 



273 



Polar bodies, 1 1 

 Polyspermy, 17 

 Pregnancy (human), occur- 

 rence of, 322 

 Prepuce, 318 

 Primary segmentation : Chick, 



229 

 Primitive axis. 296 



groove: Frog, 30; Chick, 



124 



knot, 293 

 ova: Chick, 240 

 streak: Frog, 30; Chick, 



123; Mammal, 294 

 streak, cross-section of: 

 Chick, 124 



streak and groove, meaning 

 of: Chick, 125 



Primitive germ cell (see Gon- 

 oblast) 



Pro-amnion: Chick, 160 



Pro-chorion, 292 



Pronephros: (see Head-kid- 

 ney) 

 fate of : (see Head-kidney) 



Pro-otic: Frog, 77 



Protodaeum : Frog, 45-47; 

 Chick, 206-207 



Proto- vertebra : (see Meso- 

 blastic somite) 



Pulmo-cutaneous arch: Frog, 

 67 



Pulmonary trunk: Chick, 241 



Pupil: Chick, 182 



Pygostyle: Chick, 230 



Rana temporaria: Frog, i 

 Reduction division, 12 

 Reproductive organs : Frog, 



87-89; Chick, 237-241 

 Retina: Chick, 179 

 Ribs: Chick, 265 



Scales: Chick, 282 

 Sclerotic coat: Chick, 181 

 Scrotum, 318 

 Second day, development of: 



Chick, 139 

 Secondary segmentation: 



Chick, 229 

 Segmental duct: (see Archi- 



nephric duct) 

 Segmental plate: Frog, 70; 



Chick (5 e e Vertebral 



plate) 

 Segmentation, cavity: Frog, 



20-2 1 ; Chick, 105 ; Mam- 

 mal, 290 

 complete: 9697 

 of the egg; Frog, 17-21; 



Chick, 96-103 

 nucleus: Frog, 16 



